Improvement in lifting-jacks



v UNITED STATES PATENT OFFICE.

SAMUEL SHOEMAKER, OF SMITHVILLE, OHIO.

lMPROVEM ENT l.N LlFTlNG-JACKS.

Specification forming part of Letters Patent No. 33,608, datedOctober29, 1861.

To a/ZZ whom t may concern:

Beit known that I, SAMUEL SHOEMA'KER, ot Smithville, Wayne county, andState of Ohio, have invented certain new and useful Improvements inLifting-Jacks; andIdo hereby declare that the following is a full,clear, and exact description of the same, reference being had to theaccompanying drawing, and to the letters of reference marked thereon.

In the annexed drawing, making part of this specification, A representsa stand or frame piece, upon which two standards B and C are erected. h

D and E are two curved rack-bars, one of which D passes through slots inthe standards, with its upper end confined to the lever F. The other ispivotedkat its lower end to the standard O, While its upper end plays ina slot in the lever F. In the standard C is a pin c, upon which theteeth ot bar D catch when it is desirable to station it at any point. Xis a pin in the lever, upon which the teeth ot the bar E catch when itis to be stationed at any desired point. It will be seen that by meansof these two curved rack-bars the lever may be raised and lowered andstationed at any desired point to suit the height of different vehicleswith great ease and celerity.

Having now fully described my invention, what I claim as new, and desireto secure by Letters Patent, is

The curved rack-bars D E, the lever F, and the standards B C,when thesame are arranged and constructed as and for the purpose specified.

SAMUEL SHOEMAKER.

Vitnesses:

C. M. ALEXANDER, I. SAWYER.

